I'm similar to Di_Vosh, in the sense that I contract IT/Business services to clients, I do pretty much as he said, pay my own workcover, but very often I get the agency to cover PI and payroll tax.
There are contractor pilots, an overseas agency I used to work through in a previous life offer offshore umbrella structures for them, most of these guys are domiciled in the mid east, and it is not a do-able or wise structure to employ here in OZ , because the ATO are really on the ball here, and besides both the "alienation of personal services ruling" and 80/20 rule makes it untenable
Besides, Mid east guys have their awards large and far and above outweigh the slimmest posibility of pimping their trade here or within the EU for longer than 6 months of the year.